Porous MnOx for low-temperature NH3-SCR of NOx: the intrinsic relationship between surface physicochemical property and catalytic activity
Source abstract
Abstract
Three kinds of porous MnOx catalysts consisted of nanoparticles (about 6.5, 8.5, and 21 nm, respectively) were successfully prepared by three different methods, co-precipitation method (CP), citric acid method (CA), and hydrothermal method (HT), respectively. Their physicochemical properties were characterized by TEM, XRD, BET, XPS, H2-TPR, and NH3-TPD in detail, and their catalytic activities were evaluated by the selective catalytic reduction (SCR) of NOx with NH3 in the temperature range of 60~300 °C. The results showed that their catalytic activities decreased in the order of MnOx/HT > MnOx/CA > MnOx/CP in the region of 60–120 °C due to the dominant factor resulted from the reducibility of MnOx. In contrast, their catalytic activities declined in the order of MnOx/CA > MnOx/HT > MnOx/CP in the region of 180–300 °C, which can be attributed to the amount of acid sites on the surface of these catalysts. In the region of 120–180 °C, the as-prepared three catalysts exhibited high catalytic activity with 100% NOx conversion under a high gas hourly space velocity (GHSV) of 36,000 h−1.
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Research context
OpenAlex topics: Catalytic Processes in Materials Science · Catalysis and Oxidation Reactions · Gas Sensing Nanomaterials and Sensors
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